Global Patent Index - EP 0133724 A3

EP 0133724 A3 19850417 - HIGH-FREQUENCY AMPLIFIER WITH DISTORTION COMPENSATION

Title (en)

HIGH-FREQUENCY AMPLIFIER WITH DISTORTION COMPENSATION

Publication

EP 0133724 A3 19850417 (EN)

Application

EP 84201113 A 19840730

Priority

NL 8302720 A 19830801

Abstract (en)

[origin: EP0133724A2] HF-amplifier device comprising a first transistor which is controlled at its base by a signal source and whose collector is connected to a load, also comprising a second transistor for compensating for the distortion occurring in the first transistor. According to the invention, this distortion is measured by comparing the collector output voltage of the first transistor with the collector voltage of a so-called third transistor, which is highly linearized by means of negative emitter feedback and which evidences a similar voltage gain as the first transistor and whose base is coupled to the base of the first transistor. Said distortion is thereafter compensated for in the forward direction by using the collector difference voltage of the first and third transistor as a control voltage for a second transistor which is connected to the load as an emitter follower. This results at the same time in a low output impedance of the HF-amplifier device.

IPC 1-7

H03F 1/32; H03F 3/19

IPC 8 full level

H03F 1/32 (2006.01); H03F 3/19 (2006.01); H03F 3/45 (2006.01)

CPC (source: EP)

H03F 1/3211 (2013.01); H03F 1/3223 (2013.01); H03F 3/19 (2013.01)

Citation (search report)

  • [X] US 4240041 A 19801216 - HASHIMOTO MASARU [JP], et al
  • [Y] US 4146844 A 19790327 - QUINN PATRICK A
  • [AD] IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. SC-8, no. 6, December 1973, pages 440-447, New York, USA;W.J. McCALLA et al.: "An integrated IF amplifier"
  • [A] ELECTRONICS, vol. 53, no. 20, 11th September 1980, pages 124-130, New York, USA; I. REFIOGLU: "Achieving stability in IC oscillators"

Designated contracting state (EPC)

DE FR GB IT

DOCDB simple family (publication)

EP 0133724 A2 19850306; EP 0133724 A3 19850417; BR 8403788 A 19850709; ES 534718 A0 19850401; ES 8504412 A1 19850401; JP S6052105 A 19850325; NL 8302720 A 19850301

DOCDB simple family (application)

EP 84201113 A 19840730; BR 8403788 A 19840730; ES 534718 A 19840730; JP 15653584 A 19840728; NL 8302720 A 19830801